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<head><title>mergePairs -- merge sorted lists of pairs</title>
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<div><h1>mergePairs -- merge sorted lists of pairs</h1>
<div class="single"><h2>Description</h2>
<div><tt>mergePairs(x,y,f)</tt> merges sorted lists of pairs.<p/>
It merges <tt>x</tt> and <tt>y</tt>, which should be lists of pairs <tt>(k,v)</tt> arranged in increasing order according to the key <tt>k</tt>. The result will be a list of pairs, also arranged in increasing order, each of which is either from <tt>x</tt> or from <tt>y</tt>, or in the case where a key <tt>k</tt> occurs in both, with say <tt>(k,v)</tt> in <tt>x</tt> and <tt>(k,w)</tt> in <tt>y</tt>, then the result will contain the pair <tt>(k,f(v,w))</tt>. Thus the function <tt>f</tt> is used for combining the values when the keys collide. The class of the result is taken to be the minimal common ancestor of the class of <tt>x</tt> and the class of <tt>y</tt>.<p/>
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<div class="single"><h2>See also</h2>
<ul><li><span><a href="_merge_lp__Hash__Table_cm__Hash__Table_cm__Function_rp.html" title="merge hash tables">merge</a> -- merge hash tables</span></li>
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<div class="waystouse"><h2>Ways to use <tt>mergePairs</tt> :</h2>
<ul><li>mergePairs(BasicList,BasicList,Function)</li>
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